(navigation image)
Home American Libraries | Canadian Libraries | Universal Library | Community Texts | Project Gutenberg | Children's Library | Biodiversity Heritage Library | Additional Collections
Search: Advanced Search
Anonymous User (login or join us)
Upload
See other formats

Full text of "The manufacture and properties of iron and steel"

.326
METALLURGY OP'IEOK AND STEEL.
Pottstown Iron Company, being^bej'ond the capacity of the-machine at Steel ton, and the determinations of elastic limit are, thereof ore,'not comparable. :
•-•'•                                    TABLE XVI-M,
Influence upon'the Elongation of Changes in Width (Barba).
Number of sample.	Dimensions in inches.			Ratio of -width to thickness.	Elongation; per cent.
	Length.	Width.	Thickness.		
1 2. 3 .4: 5 6 7 8	3.94 8.94 8.94 8.94    , 8.94 8.94 3.94 8.94	0.894 0.787 1.181 1.575 1.964 2.852 2.756 8.150	0.394 0.894 , 0.394 0.894 0.394 0.394 0.394 0.394	1 . 2 3 4 5 6-7 8	81.0 34.0 35.0 87.2 89.0 40,8 38.5 84.5
(3) The elongation increases regularly as the width increases. ... (4) The reduction of .area decreases as the width increases.
The same subject was investigated by.Barba,* his results being ''given in Table XVI-M.   The figures show a continual increase in " elongation until the width is six times the thickness, after which ' the stretch grows less.   The latter point is not important in practice, since there is no occasion to use such a wide section, and in 'plates of ordinary thickness the strength of such pieces is beyond '•the capacity of most machines.
'•'•'      •   •••         ':-         "•••• TABLE XVI-K         •  -:•      •   ' .
Effect of an Increase of Width upon the Elongation.t
Thickness in in.		"Width of piece in inches.				
		1	1H	l*A	»4	3
'H	Number of 'pieces .*...' ....... •	180 57950 26.27	120 57878 26.98	80 68102 28.01	80 67800 29.49	18 67676 80.82
	Average ultimate strength; Ibs.per sq. inch . . Elongation in 8 inches ; per cent .........					
						
%	Number of pieces ....... .  ; ........	20 56680 26.92	',25 57001 26.96	20 66720 27.91	20 . 66860 80.17	20 65870 81.02
	Average ultimate strength; Its. per sq. inch . . •JClongationin 8 inches ; per cent ..... ......					
The increase in elongation in greater widths has been shown by E. A. Custer, of the Baldwin Locomotive Works, Philadelphia, Pa.,
:' * Resistance des Materiaua:-; Metnoires de la Societe des Ingenieurs Civils, Vol. 1^18^
Pr682.................._................        ......,....'„.    ,'.......
t E. A. Ouster, private •communication.        :              " '